Weilin molds regulator knobs for gas-control and medical gas equipment. Diameter is only the starting point: the bore profile, engagement depth, torque and material determine whether the knob will fit and turn correctly.
The two detailed product pages show the outside geometry and internal drive. A similar appearance does not guarantee interchangeability.
A ribbed PA66 knob for oxygen regulator and gas-flow control assemblies. The internal drive geometry is checked against the mating valve stem.
A larger ribbed knob in glass-filled nylon with a splined bore. The wider body gives more grip area for rotary control.
Different diameters, colors and drive geometries can be reviewed as a family when several controls belong to the same equipment platform.
Send a stem drawing or sample with the knob requirements. We can then review the bore, grip and material as one part.
Send knob detailsThese pages are for OEM manufacturing programs. They are not a retail replacement-knob catalogue.
The stem and bore are reviewed together so the sample check has a clear reference.
A 2D drawing, 3D file or physical sample gives us a useful starting point.
We check the interfaces, material requirement, cosmetic faces and production volume.
The quotation states the agreed scope. First samples are checked against that scope.
Inspection and supply records follow the drawing and purchase requirements agreed for the program.
Knobs often sit beside a molded housing or a protected pressure gauge.
These pages show the molding controls, approval steps and medical-gas experience behind a custom regulator knob program.
Send the stem dimensions, a drawing or a sample. Include the expected torque, color and annual quantity if those are already known.
Yes. Send the stem drawing, bore profile, engagement depth and expected operating torque, or provide the mating component as a sample. Fit cannot be confirmed from the outside diameter or a photo alone.
No assumption should be made from diameter alone. The two examples use different materials and internal drive geometry. The stem interface must be checked before selecting or modifying a design.
Material and color can be reviewed for an OEM program. The choice depends on torque, environment, appearance, resin performance and the production quantity needed for stable color control.
Please send the knob drawing or sample, valve-stem details, required resin, color, torque requirement, annual volume and any inspection or packaging instructions.
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